linux-kernel - [PATCH] netfilter: use krealloc() in nf_conntrack

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Date:	Thu, 22 May 2008 21:55:37 +0300 (EEST)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	kaber@...sh.net
cc:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, mpm@...enic.com, clameter@....com
Subject: [PATCH] netfilter: use krealloc() in nf_conntrack_extend.c V2

To: kaber@...sh.net
[PATCH] netfilter: use krealloc() in nf_conntrack_extend.c V2
From: Pekka Enberg <penberg@...helsinki.fi>

The ksize() API is going away because it is being abused and it doesn't even
work consistenly across different allocators. Therefore, convert
net/netfilter/nf_conntrack_extend.c to use krealloc().

Cc: <netfilter-devel@...r.kernel.org>
Cc: <netdev@...r.kernel.org>
Cc: Matt Mackall <mpm@...enic.com>
Cc: Christoph Lameter <clameter@....com>
Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
---
Patrick, please use this patch instead. The previous one did the moving
unconditionally which is wrong. This one moves entries around only if
krealloc() allocated a new buffer.

 net/netfilter/nf_conntrack_extend.c |   10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

Index: slab-2.6/net/netfilter/nf_conntrack_extend.c
===================================================================
--- slab-2.6.orig/net/netfilter/nf_conntrack_extend.c	2008-05-22 21:52:12.000000000 +0300
+++ slab-2.6/net/netfilter/nf_conntrack_extend.c	2008-05-22 21:52:26.000000000 +0300
@@ -88,13 +88,11 @@
 	newlen = newoff + t->len;
 	rcu_read_unlock();
 
-	if (newlen >= ksize(ct->ext)) {
-		new = kmalloc(newlen, gfp);
-		if (!new)
-			return NULL;
-
-		memcpy(new, ct->ext, ct->ext->len);
+	new = krealloc(ct->ext, newlen, gfp);
+	if (!new)
+		return NULL;
 
+	if (new != ct->ext) {
 		for (i = 0; i < NF_CT_EXT_NUM; i++) {
 			if (!nf_ct_ext_exist(ct, i))
 				continue;
--
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